You could try lowering the fork legs in the crown. The tops of the stanchions look to be maybe 3mm above the crown clamps. As suggested, installing a tire with a smaller width would be a smart thing to do.
Air Pressure: The Mag 20 has a very small amount of air in each leg to act as the spring. When you inflate each leg to, lets say 30 psi, remove the pump, them insert the pump again, some of that air in the leg must fill the pump and pressure guage. You will always see a significant drop in pressure by checking it with a pump.
Oil Level: You must remove the legs from the crown and remove the top caps to see the oil level. The Mag 20 is very similar to the Mag 21. The biggest difference is the valve body and the addition of a negative spring. You can follow the Mag 21 service manual to check and change the oil in the Mag 20. The procedure is the same.
Last edited by Svr; 05-17-09 at 04:12 PM.